Electric lamp or similar device



April 12, 1938. P. o. cATuu ELECTRIC LAMP OR SIMILAR DEVICE Filed March 13, 1937 '2' /2 1 3 20 /5 S 21 i I uwl J 3 4 VG 'u Inventor: Fo.u\ O. Cari-Jun, e: i6 6.!

IS Attorney.

Patented Apr. 12, 1938 ELECTRIC LAMP R, SIMILAR DEVICE Paul 0. Cartun, Cleveland Heights, Ohio, assignor to General Electric Company, a corporation of New York Application March 13,

7 Claims.

My invention relates to electric lamps and. similar devices comprising a container or envelope having an energy translation element, such as a filament or electrodes, sealed therein. More particularly, my invention relates to tubular lamps or similar devices having a base at each end and still more particularly to such devices comprising a double .walled container.

One of the objects of my invention is to provide a double walled electric lamp or similar device of simple and rugged construction. Another object is to provide a construction such that the two containers may be readily exhausted and, if desired, filled with a gas independently of each other. Another object is to provide an electric device of the type referred to in which the bases consist of metal discs sealed directly to the ends of the tubular glass containers as end walls and contacts, such as the construction shown and claimed in my Patent .No. 2,032,-791,' of March 3,.

1936. With such a construction, one of the said discs may serve as the end wall for both containers. Other objects and advantages of my in- ,vention will appear from the following description of species thereof and from the drawing.

In the drawing, Fig. 1 is an elevation, in section, of an incandescent lamp comprising my invention and Fig. 2 is a'similar view of a gaseous discharge lamp. Referring to Fig. 1, the lamp comprises an outer glass container I0 having a base member consisting of a metal disc II sealed directly to each end thereof as an end wall-and contact. The particular discs I I illustrated in the drawing are in this case identical and are of the type 'shown in my Patent No. 2,032,791, hereinbefore referred to. An inner glass container I2 is sealed at one end to the right hand disc I I and. has another base member. or disc I3 sealed to its left hand end. Electrical contact is provided between the disc I3 and the left hand disc II by a spring II which is compressed between said discs. The inner container I2'has a filament I5 therein extending axially thereof. The said filament may be attached at its ends toshort support wires I6I6 which are in turn secured to the wire end portions II-I1 of. a stay which includes a glass rod III. The extreme ends of said wire portions II-I'I are bent into transversely disposed loops 50 which engage the inner sides of shoulders I9 and 20 on the disc I3 and the right hand disc II, re-

spectively.

The inner container I2 is exhausted through an opening 2i at the center of the right hand disc II,-the said opening being subsequently sealed by 1937, Serial No. 130,713

a glass mass 22 constituting the residue of the exhaust tube. The outer container I0 may also be exhausted and filled with a gas, if desired, through a similar opening 2| (not shown) in the left hand disc I I, the said opening being sealed by the glass mass 22. The lamp may be mounted by suitable holders engaging around the shoulders 20 on the discs IIII.

The lamp may be assembled by first sealing the left hand disc II to the end of the outer container III and the disc I3 to the end of the inner container I2. The container I2 may then be placed in the container III with the spring I4 between the said discs II and I3. The mount, including the stay- I8-I'II'I, supports I6I6 and filament l5, may then be inserted in the said container I2. Then the right hand disc II may be sealed to the ends of containers I0 and I2, the said mount being slightly compressed between the-said disc and the disc I3. The lamp is completed-by evacuating the containers I2 and I0 through the right and left hand discs II--II respectively.

The lamp may also be assembled by first sealing the right hand disc II to the containers I2 and I0, inserting the mount, sealing the disc I3 to container I2 and then sealing the left hand disc II to the container III with the spring I 4 in place. However, when this method is followed, care must be taken to avoid damag ng the spring II by the sealing heat.

The construction of the discharge lamp shown in Fig. 2 is similar to the incandescent lamp in Fig. 1 except that electrodes 23-23 are substituted for the filament I5 and its supporting structure. The said electrodes may consist of tungsten wire coiled into a double helix with-the primary mandrel remaining therein and having a coating of electron emissive material, such as barium oxide, thereon. The said electrodes may be welded at their ends to the disc I3 and the right hand disc II. The inner container I2 may have a filling of a few millimeters of a rare gas such as argon or neon and may also contain a small quantity of metallic vapor 24, such as mercury. The outer container I0 may be evacuated or it may be filled with a gas adapted to conserve the heat in the inner container or with a cooling gas such as hydrogen or helium, or it may be left open to the atmosphere through the opening 2| (not shown) in the left hand disc II.

While I have shown only two species of my invention, it will be obvious to those skilled in the art that various changes, substitutions and omissions may be made by those skilled in the art without departing from the spirit of my invention. For example, the form of the discs il--- l i-l3 may be varied greatly. Discs of the type shown in the U. S. applications Nos. 3,334, H. D. Blake, filed January 24, 1935; and 75,772, G. E.

Inman,. filed April 22, 1936, may be used. The

outer container Ill may be colored if desired. The left hand end of the inner container 12 may be further supported, for example by a perforated washer or other member surrounding the end of the said container i2 or the disc i3 and engaging the wall of the outer container ill but permitting exhausting of the outer container if desired. The lamp may also be water cooled by fusing nipples to the ends of the outer container l2, or to the left hand disc I I around the opening 2| and to the right hand disc i l around an opening at a point between the outer and inner containers.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. An electrical device comprising outer and inner glass containers, a common metal base member sealed to one end of bothoi said containers, a separate metal base member sealed to the opposite ends of each of said containers, means electrically connecting said last named base members, and an electric energy translation element within said inner container electrically connected to the said base membersv at the ends thereof. a

2. An electrical device comprising outer and inner glass containers, a common metal base member sealed to one end of both of said containers and having a. sealed exhaust opening communicating-with said inner container, a separate metal base member sealed to the opposite ends of;

each of said containers, means electrically connecting said last named base members, and an electric energy translation element within said inner container electrically connected to'the said base members at the ends thereof.

3. An electrical device comprising outer and inner glass containers, a common metal base member sealed to one end of both of said containers and having a sealed exhaust opening communicating with said inner container, a separate metal base member sealed to the opposite ends of each of said containers, the said one of the last namedabase members sealed to the outer base members, and an electric energy translation connected to the said base members at the ends thereof 4. An electrical device comprising concentrically arranged outer and inner tubular glass containers, a common metal base member sealed directly to one 01'. the open ends of 'both of said containers, a separate metal base member sealed directly to the oppomte open ends of each of said containers, means electrically connecting said last named base members; and an electric energy translation element within said inner container electrically connected to the said base members at the ends thereof.

5. An electrical device comprising concentrically arranged outer and inner tubular glass containers, a common metal base member sealed directly to one of the open ends oi'both of said containers and having a sealed exhaust opening communicating with said inner container, a separate metal base member sealed directly to the opposite open ends of each of said containers,

means electrically connecting said last namedbase members, and an electric energy translation element within said inner container electrically connected to the said base members at the ends directly to one of the open ends of both of said containers and having a sealed exhaust opening communicating with said inner container, 9. separate metal base member sealed directly to the opposite open ends of each oiv said containers,

the said one 01 the last named base members sealed to the outer container having a sealed exhaust opening therein, means electrically connecting saidlast named base members, and an electric energy translation element within said inner container electrically connected to the said' to one of the open ends of both of said containers, a separate metal disc sealed directlyto the opposite open ends of each of said containers, means electrically connecting said last named discs, and an electric energy translation element within said inner container electrically connected to the said discs at the ends thereof.

PAUL O. CARTUN. 

